I had my road glide dyno'd the other day to see what kind of difference the heads I installed are going to make, no tune, just a run. Anyway I get home and look over the sheet and it has the HP and TQ crossing at around 4700rpm instead of 5250rpm like it is supposed to.

Has anyone ever seen this? They were trying to sell me some tuning so maybe they jacked with it somehow? It has the Sae smoothing 5 like all the other pulls that I have had just the wrong rpm were the torque and hp cross.

thanks

 

I just had my 06 dyno tuned, and the final run has the cross over at about the same spot. I've got arlen ness a/c, se touring pipes ( no cat ), full sac true duells, and andrews 21g cams, no head work. so it's prob not out of line.

 

Not an expert, but if the scaling is not the same for hp and tq, the lines don't cross at 5200. Scaling simply means that the 90hp horizontal line is the same line for 90 tq.

 

ok. that makes sense. I never thought about that being an issue.
thanks

 

The lines will always cross at 5252rpm if the scaling is the same on both sides for HP and Torque.

The formula for HP is RPM X Torque / 5252

Steve